In the Java World, we have a set of library, Commons, from Apache. They provide a lot of cores functions such as email, logging and validations. In our .Net World, the open source community build a set of Commons Library. They provide a lot of cores functions, such as ORM, CSV Parser and validations. Those are different from the java version. Anyway, there are a strong set of functions. They are useful for building your own web framework. Such as, Logging and CSV Parser are essential functions for a web framework.